Judging by the lack of replies to this message, I'm guessing no one has actually tried this method. I am going to try it though - maybe I will be the first.
Has anyone out there successfully healed tooth decay by this or any other method?
I wonder if the OP is still around?
If you are, I would like to know if you ever did find any good ways to get the comfrey leaves to adhere to front teeth? This is what I will need to do to really experiment with this method, since my cavity is not located on a molar.